Finding the Fourth Proportional to 1,568.66, 2,164.81 and 860.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,568.66 : 2,164.81 = 860.56 : x
2. Step 2: Convert to fraction form
   1,568.66/2,164.81 = 860.56/x
3. Step 3: Cross multiply
   1,568.66x = 2,164.81 × 860.56
4. Step 4: Simplify right side
   1,568.66x = 1,862,948.89
5. Step 5: Solve for x
   x = 1,862,948.89/1,568.66
6. Step 6: Final answer
   x = 1,187.61